/*
BEM 设计模式
模块 {没有前缀，多个单词用 - 连接}
元素 {元素在模块之后，可以有多个层级，以 __ 连接}
修饰 {某元素、或者某模块特别的状态，必须有一个状态名和状态值，使用 _ 连接}
*/

.header {
    background-color: #f7f7f7;
}

.header__wrap {
    height: 80px;
    width: 1200px;
    position: relative;
    margin: 0 auto;
}

.header__logo {
    width: 150px;
    height: 38px;
    line-height: 38px;
    font-size: 20px;
    color: #07111b;
    text-indent: 50px; /*距离左边50px*/
    background: url("../img/logo.png") left center no-repeat;
    background-size: 38px 38px;
    position: absolute;
    top: 50%;
    margin-top: -19px;
    left: 20px;
}

.header__nav {
    position: absolute;
    right: 20px;
    height: 38px;
    top: 50%;
    margin-top: -19px;
}

.header__nav-item {
    color: #292f35;
    font-size: 14px;
    display: block;
    height: 38px;
    line-height: 38px;
    float: left;
    margin-left: 40px;
    position: relative;
}

.header__nav-item:hover {
    color: #f01400;
}

.header__nav-item_status_active {
    color: #f01400;
}

.header__nav-item_status_active::after {
    content: " ";
    display: block;
    position: absolute;
    left: 0;
    bottom: 0;
    height: 2px;
    width: 100%;
    background-color: #f01400;
}

.header__nav-item_custom_button {
    background-color: #000;
    color: #f4f4f5;
    text-align: center;
    width: 90px;
    border-radius: 5px;
}

/*第一屏*/
.screen-1 {
    height: 800px;
    /*background-color: #e7e7e7;*/
    background: url("../img/bg-screen-1.png") no-repeat center;
    position: relative;
    background-size: cover; /*背景图覆盖模式*/
}

.screen-1__heading {
    font-weight: normal;
    margin: 0;
    font-size: 46px;
    color: #4d555d;
    text-align: center;
    padding-top: 152px;
}

.screen-1__phone {
    width: 1375px;
    height: 305px;
    background: url("../img/screen-1-phone.png") no-repeat center;
    position: absolute;
    left: 50%;
    margin-left: -687px;
    bottom: 180px;
    z-index: 2;
}

.screen-1__shadow {
    width: 1233px;
    height: 411px;
    background: url("../img/screen-1-shadow.png") no-repeat center;
    position: absolute;
    left: 50%;
    margin-left: -616px;
    bottom:0;
    opacity: .8;
}

.screen-1__heading b {
    color: #f01400;
    font-weight: normal;
}

/*第二屏*/
.screen-2{
    background-color: #fafafa;
    height: 800px;
    position: relative;
    overflow: hidden;
}

.screen-2__heading{
    color: #f01400;
    font-size: 46px;
    line-height: 46px;
    text-align: center;
    padding-top: 96px;
}

.screen-2__subheading{
    font-size: 14px;
    line-height: 28px;
    padding-top: 25px;
    text-align: center;
    color: #2c3137;
}

.screen-2__phone{
    width: 928px;
    height: 873px;
    background: url("../img/bg-screen-2.png") no-repeat center;
    position: absolute;
    left: 50%;
    bottom: -345px;
    margin-left: -464px;
    margin-top: 50px
}

.screen-2__point{
    width: 108px;
    height: 22px;
    font-size: 22px;
    line-height: 22px;
    padding-right: 112px;
    color: #4d555d;
    background: url("../img/icon-point-right.png") no-repeat center right;  /*垂直居中 右对齐*/
    position: absolute;
}

.screen-2__point_custom_right{
    padding: 0 0 0 112px;
    background: url("../img/icon-point-left.png") no-repeat center left;
}

.screen-2__point_i_1{
    top: 150px;
    left: -150px;
}
.screen-2__point_i_2{
    top: 30px;
    right:130px;
}
.screen-2__point_i_3{
    top: 330px;
    right: 30px;
}

/*第三屏*/

.screen-3{
    height: 800px;
    background-color: red;
    position: relative;
    overflow: hidden;
}

.screen-3__wrap{
    width: 1200px;
    height: auto;
    margin: 0 auto;
}

.screen-3__heading{
    color: #fff;
    font-size: 46px;
    line-height: 46px;
    text-align: left;
    padding-top: 94px;
}

.screen-3__subheading{
    font-size: 14px;
    line-height: 28px;
    padding-top: 25px;
    text-align: left;
    color: #fff;
}

.screen-3__phone{
    width: 729px;
    height: 900px;
    background: url("../img/bg-screen-3.png") no-repeat center;
    position: absolute;
    right: 0;
    top: 195px;
}


/*第四屏*/
.screen-4{
    height: 800px;
}